(4). Suppose that f: G→ G' is a monomorphism, G is a non-trivial group and G' is non-abelian. Then G can not be abelian. (5). If every subgroup of G is a finite group, then G must be a finite group. (6). Let Z14 acts on a set X with 3 elements. Then there are at least 2 orbits under the action.
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- Prove or disprove that H={ hGh1=h } is a subgroup of the group G if G is abelian.Exercises 31. Let be a group with its center: . Prove that if is the only element of order in , then .Label each of the following statements as either true or false. The Cayley table for a group will always be symmetric with respect to the diagonal from upper left to lower right.
- Suppose that the abelian group G can be written as the direct sum G=C22C3C3, where Cn is a cyclic group of order n. Prove that G has elements of order 12 but no element of order greater than 12. Find the number of distinct elements of G that have order 12.34. Suppose that and are subgroups of the group . Prove that is a subgroup of .Exercises 8. Find an isomorphism from the group in Example of this section to the multiplicative group . Sec. 16. Prove that each of the following sets is a subgroup of , the general linear group of order over .
- 9. Suppose that and are subgroups of the abelian group such that . Prove that .18. If is a subgroup of the group such that for all left cosets and of in, prove that is normal in.Label each of the following statements as either true or false. Two groups can be isomorphic even though their group operations are different.
- For an integer n1, let G=Un, the group of units in n that is, the set of all [ a ] in n that have multiplicative inverses. Prove that Un is a group with respect to multiplication. (Sec. 3.5,3,6, Sec. 4.6,17). Find an isomorphism from the additive group 4={ [ 0 ]4,[ 1 ]4,[ 2 ]4,[ 3 ]4 } to the multiplicative group of units U5={ [ 1 ]5,[ 2 ]5,[ 3 ]5,[ 4 ]5 }5. Find an isomorphism from the additive group 6={ [ a ]6 } to the multiplicative group of units U7={ [ a ]77[ a ]7[ 0 ]7 }. Repeat Exercise 14 where G is the multiplicative group of units U20 and G is the cyclic group of order 4. That is, G={ [ 1 ],[ 3 ],[ 7 ],[ 9 ],[ 11 ],[ 13 ],[ 17 ],[ 19 ] }, G= a =e,a,a2,a3 Define :GG by ([ 1 ])=([ 11 ])=e ([ 3 ])=([ 13 ])=a ([ 9 ])=([ 19 ])=a2 ([ 7 ])=([ 17 ])=a3.True or False Label each of the following statements as either true or false. 4. If is an abelian group, then for all in .Let H and K be subgroups of a group G and K a subgroup of H. If the order of G is 24 and the order of K is 3, what are all the possible orders of H?